We do see quite a lot of SGR's just like in the USA but these shots are from the thread I referenced previously, and again I probably missed the diagnosis since I now feel that the major structural weakness for this Euc was the impact of the SGR on the root tissues below it, yes the tree was buried to some extent but the SGR ensured the decline and death of too much functional tissue below it in the supporting butress roots, permitting fungal colonisation and failure due to wind loading.
Here's the fallen tree, also rains in the days before added to the mix
a closer look at the trunk
Where the SGR pressed against the trunk tissues
From another angle clearly showing the extent of the constriction
Highlighted
SGR's are particularly common in our street trees, both because of the poor nursery stock, but also due to hostile growing conditions that greatly deflect butress root growing directions at an early stage.